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D14049.03
MAY 2008
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TANDBERG VIDEO COMMUNICATIONS SERVER
ADMINISTRATOR GUIDE
Introduction Getting Started
Overview and
Status
System
Conguration
VCS
Conguration
Zones and
Neighbors
Call
Processing
Bandwidth
Control
Firewall
Traversal
Maintenance Appendices
DNS Conguration
This section gives examples of DNS conguration using
Microsoft DNS Server and BIND 8 & 9.
In these examples we show how to set up an SRV record to
handle H.323 URIs of the form user@example.com. These are
handled by the system with the fully qualied domain name of
vcs.example.com which is listening on port 1719, the default
registration port.
Using Microsoft DNS Server you can add the SRV record using either the command line or the MMC snap-in.
To use the command line, on the DNS server open a command window and enter:
dnscmd . /RecordAdd domain service _ name SRV Priority Weight Port Target
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where:
domain
is the domain into which you wish to insert the record
service _ name
is the name of the service you’re adding
Priority
is the priority as dened by RFC 2782 [3]
Weight
is the weight as dened by RFC 2782 [3]
Port
is the port on which the system hosting the domain is listening
Target
is the FQDN of the system hosting the domain
For example:
dnscmd . /RecordAdd example.com _ h323ls. _ udp SRV 1 0 1719 vcs.example.com
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Verifying the SRV Record
There are a range of tools available to investigate DNS records.
One commonly found on Microsoft Windows and UNIX platforms
is nslookup. Use this to verify that everything is working as
expected.
For example:
nslookup -querytype=srv _ h323ls. _ udp.
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example.com
and check the output.
BIND is a commonly used DNS server on UNIX and Linux systems. Conguration is based around two sets of text les: named.conf
which describes which zones are represented by the server, and a selection of zone les which describe the detail of each zone.
BIND is sometimes run chrooted for increased security. This gives the program a new root directory, which means that the
conguration les may not appear where you expect them to be. To see if this is the case on your system, run
ps aux | grep named
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This will give the command line that named (the BIND server) was invoked with. If there is a -t option, then the path following that is
the new root directory and your les will be located relative to that root.
In /etc/named.conf look for a directory entry within the options section. This will give the directory in which the zone les are
stored, possibly relative to a new root directory. In the appropriate zone section, a le entry will give the name of the le containing the
zone details.
Overview Microsoft DNS Server
BIND 8 & 9
It is assumed that both A and AAAA records already exist
for vcs.example.com. If not, you will need to add one.
For more details of how to congure BIND servers and the DNS system in general see the publication DNS and BIND [6].